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        </div><article class="page single"><h1 class="single-title animated flipInX">自定义分布式可重入锁</h1><div class="post-meta">
            <div class="post-meta-line"><span class="post-author"><a href="https://wlizhi.cc" title="Author" target="_blank" rel="noopener noreffer author" class="author"><i class="fas fa-user-circle fa-fw"></i>Wlizhi</a></span>&nbsp;<span class="post-category">收录于 <a href="/categories/%E5%B9%B6%E5%8F%91%E7%BC%96%E7%A8%8B/"><i class="far fa-folder fa-fw"></i>并发编程</a></span></div>
            <div class="post-meta-line"><i class="far fa-calendar-alt fa-fw"></i>&nbsp;<time datetime="2021-01-19">2021-01-19</time>&nbsp;<i class="fas fa-pencil-alt fa-fw"></i>&nbsp;约 1047 字&nbsp;
                <i class="far fa-clock fa-fw"></i>&nbsp;预计阅读 3 分钟&nbsp;<span id="/posts/concurrent/reentrant-distributed-lock/" class="leancloud_visitors" data-flag-title="自定义分布式可重入锁">
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            </div><div class="content" id="content"><p>思路：先获取进程内的独占锁，再通过redis原子操作获取锁。以减少与redis的网络交互。对于锁的可重入，使用ThreadLocal<Integer>进行标识，每重入一次加一，释放一次减一。</p>
<p>代码如下：</p>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="line"><span class="cl"><span class="cm">/**
</span></span></span><span class="line"><span class="cl"><span class="cm"> * 分布式可重入锁
</span></span></span><span class="line"><span class="cl"><span class="cm"> *
</span></span></span><span class="line"><span class="cl"><span class="cm"> * @author Eddie
</span></span></span><span class="line"><span class="cl"><span class="cm"> */</span>
</span></span><span class="line"><span class="cl"><span class="kd">public</span> <span class="kd">class</span> <span class="nc">RedisReentrantLock</span> <span class="kd">extends</span> <span class="n">ReentrantLock</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">	<span class="cm">/**
</span></span></span><span class="line"><span class="cl"><span class="cm">	 * lockId，锁id
</span></span></span><span class="line"><span class="cl"><span class="cm">	 */</span>
</span></span><span class="line"><span class="cl">	<span class="kd">private</span> <span class="kd">final</span> <span class="n">ThreadLocal</span><span class="o">&lt;</span><span class="n">String</span><span class="o">&gt;</span> <span class="n">lockId</span> <span class="o">=</span> <span class="n">ThreadLocal</span><span class="o">.</span><span class="na">withInitial</span><span class="o">(()</span> <span class="o">-&gt;</span> <span class="n">UUID</span><span class="o">.</span><span class="na">randomUUID</span><span class="o">().</span><span class="na">toString</span><span class="o">());</span>
</span></span><span class="line"><span class="cl">	<span class="cm">/**
</span></span></span><span class="line"><span class="cl"><span class="cm">	 * 锁键值，由具体的业务功能定义
</span></span></span><span class="line"><span class="cl"><span class="cm">	 */</span>
</span></span><span class="line"><span class="cl">	<span class="kd">private</span> <span class="kd">final</span> <span class="n">String</span> <span class="n">lockKey</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">	<span class="cm">/**
</span></span></span><span class="line"><span class="cl"><span class="cm">	 * 当前获取锁的对象的键值
</span></span></span><span class="line"><span class="cl"><span class="cm">	 */</span>
</span></span><span class="line"><span class="cl">	<span class="kd">private</span> <span class="kd">final</span> <span class="n">String</span> <span class="n">ownerLockKey</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">	<span class="cm">/**
</span></span></span><span class="line"><span class="cl"><span class="cm">	 * redis操作客户端对象
</span></span></span><span class="line"><span class="cl"><span class="cm">	 */</span>
</span></span><span class="line"><span class="cl">	<span class="kd">private</span> <span class="kd">final</span> <span class="n">JedisCommands</span> <span class="n">jedisCommands</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">	<span class="cm">/**
</span></span></span><span class="line"><span class="cl"><span class="cm">	 * 重入次数
</span></span></span><span class="line"><span class="cl"><span class="cm">	 */</span>
</span></span><span class="line"><span class="cl">	<span class="kd">private</span> <span class="kd">final</span> <span class="n">ThreadLocal</span><span class="o">&lt;</span><span class="n">Integer</span><span class="o">&gt;</span> <span class="n">state</span> <span class="o">=</span> <span class="n">ThreadLocal</span><span class="o">.</span><span class="na">withInitial</span><span class="o">(()</span> <span class="o">-&gt;</span> <span class="n">0</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">	<span class="cm">/**
</span></span></span><span class="line"><span class="cl"><span class="cm">	 * 超时时间，默认5秒，超过此时间，将会移除锁标志，重新竞争锁对象
</span></span></span><span class="line"><span class="cl"><span class="cm">	 */</span>
</span></span><span class="line"><span class="cl">	<span class="kd">private</span> <span class="kd">final</span> <span class="kt">int</span> <span class="n">timeOutMills</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">	<span class="kd">private</span> <span class="kd">static</span> <span class="kd">final</span> <span class="kt">int</span> <span class="n">DEFAULT_TIME_OUT_MILLS</span> <span class="o">=</span> <span class="n">5_000</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">	<span class="kd">public</span> <span class="nf">RedisReentrantLock</span><span class="o">(</span><span class="n">JedisCommands</span> <span class="n">jedisCommands</span><span class="o">,</span> <span class="n">String</span> <span class="n">lockKey</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="k">this</span><span class="o">(</span><span class="n">jedisCommands</span><span class="o">,</span> <span class="n">lockKey</span><span class="o">,</span> <span class="n">DEFAULT_TIME_OUT_MILLS</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">	<span class="kd">public</span> <span class="nf">RedisReentrantLock</span><span class="o">(</span><span class="n">JedisCommands</span> <span class="n">jedisCommands</span><span class="o">,</span> <span class="n">String</span> <span class="n">lockKey</span><span class="o">,</span> <span class="kt">int</span> <span class="n">timeOutMills</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="kd">super</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">		<span class="k">this</span><span class="o">.</span><span class="na">jedisCommands</span> <span class="o">=</span> <span class="n">jedisCommands</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">		<span class="k">this</span><span class="o">.</span><span class="na">lockKey</span> <span class="o">=</span> <span class="n">lockKey</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">		<span class="k">this</span><span class="o">.</span><span class="na">ownerLockKey</span> <span class="o">=</span> <span class="n">lockKey</span> <span class="o">+</span> <span class="s">&#34;:current&#34;</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">		<span class="k">this</span><span class="o">.</span><span class="na">timeOutMills</span> <span class="o">=</span> <span class="n">timeOutMills</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">	<span class="nd">@Override</span>
</span></span><span class="line"><span class="cl">	<span class="kd">public</span> <span class="kt">void</span> <span class="nf">lock</span><span class="o">()</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="kd">super</span><span class="o">.</span><span class="na">lock</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">		<span class="k">this</span><span class="o">.</span><span class="na">redisLock</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">	<span class="kd">private</span> <span class="kt">void</span> <span class="nf">redisLock</span><span class="o">()</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="n">Random</span> <span class="n">r</span> <span class="o">=</span> <span class="k">new</span> <span class="n">Random</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">		<span class="k">while</span> <span class="o">(!</span><span class="n">tryRedisLock</span><span class="o">())</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="c1">//1000ns
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>			<span class="n">LockSupport</span><span class="o">.</span><span class="na">parkNanos</span><span class="o">(</span><span class="k">this</span><span class="o">,</span> <span class="n">r</span><span class="o">.</span><span class="na">nextInt</span><span class="o">(</span><span class="n">2000</span><span class="o">));</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">	<span class="nd">@Override</span>
</span></span><span class="line"><span class="cl">	<span class="kd">public</span> <span class="kt">boolean</span> <span class="nf">tryLock</span><span class="o">()</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="k">return</span> <span class="kd">super</span><span class="o">.</span><span class="na">tryLock</span><span class="o">()</span> <span class="o">&amp;&amp;</span> <span class="n">tryRedisLock</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">	<span class="kd">private</span> <span class="kt">boolean</span> <span class="nf">tryRedisLock</span><span class="o">()</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="n">Long</span> <span class="n">incr</span> <span class="o">=</span> <span class="n">jedisCommands</span><span class="o">.</span><span class="na">incr</span><span class="o">(</span><span class="n">lockKey</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="kt">long</span> <span class="n">expireUnixTime</span> <span class="o">=</span> <span class="n">System</span><span class="o">.</span><span class="na">currentTimeMillis</span><span class="o">()</span> <span class="o">/</span> <span class="n">1000</span> <span class="o">+</span> <span class="o">(</span><span class="n">timeOutMills</span> <span class="o">/</span> <span class="n">1000</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="n">jedisCommands</span><span class="o">.</span><span class="na">expireAt</span><span class="o">(</span><span class="n">lockKey</span><span class="o">,</span> <span class="n">expireUnixTime</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="n">String</span> <span class="n">lockId</span> <span class="o">=</span> <span class="k">this</span><span class="o">.</span><span class="na">lockId</span><span class="o">.</span><span class="na">get</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">		<span class="n">String</span> <span class="n">currentLockId</span> <span class="o">=</span> <span class="n">jedisCommands</span><span class="o">.</span><span class="na">get</span><span class="o">(</span><span class="n">ownerLockKey</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="k">if</span> <span class="o">(</span><span class="n">incr</span> <span class="o">==</span> <span class="n">1</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="n">jedisCommands</span><span class="o">.</span><span class="na">set</span><span class="o">(</span><span class="n">ownerLockKey</span><span class="o">,</span> <span class="n">lockId</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">			<span class="n">jedisCommands</span><span class="o">.</span><span class="na">expireAt</span><span class="o">(</span><span class="n">ownerLockKey</span><span class="o">,</span> <span class="n">expireUnixTime</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">			<span class="n">state</span><span class="o">.</span><span class="na">set</span><span class="o">(</span><span class="n">state</span><span class="o">.</span><span class="na">get</span><span class="o">()</span> <span class="o">+</span> <span class="n">1</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">			<span class="k">return</span> <span class="kc">true</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span> <span class="k">else</span> <span class="k">if</span> <span class="o">(</span><span class="n">lockId</span><span class="o">.</span><span class="na">equals</span><span class="o">(</span><span class="n">currentLockId</span><span class="o">))</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="n">state</span><span class="o">.</span><span class="na">set</span><span class="o">(</span><span class="n">state</span><span class="o">.</span><span class="na">get</span><span class="o">()</span> <span class="o">+</span> <span class="n">1</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">			<span class="k">return</span> <span class="kc">true</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">		<span class="n">Thread</span><span class="o">.</span><span class="na">yield</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">		<span class="k">return</span> <span class="kc">false</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">	<span class="nd">@Override</span>
</span></span><span class="line"><span class="cl">	<span class="kd">public</span> <span class="kt">void</span> <span class="nf">unlock</span><span class="o">()</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="k">this</span><span class="o">.</span><span class="na">unRedisLock</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">		<span class="kd">super</span><span class="o">.</span><span class="na">unlock</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">	<span class="kd">private</span> <span class="kt">void</span> <span class="nf">unRedisLock</span><span class="o">()</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="n">Random</span> <span class="n">r</span> <span class="o">=</span> <span class="k">new</span> <span class="n">Random</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">		<span class="n">String</span> <span class="n">currentLockId</span> <span class="o">=</span> <span class="n">jedisCommands</span><span class="o">.</span><span class="na">get</span><span class="o">(</span><span class="n">ownerLockKey</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="n">state</span><span class="o">.</span><span class="na">set</span><span class="o">(</span><span class="n">state</span><span class="o">.</span><span class="na">get</span><span class="o">()</span> <span class="o">-</span> <span class="n">1</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="k">if</span> <span class="o">(</span><span class="n">lockId</span><span class="o">.</span><span class="na">get</span><span class="o">().</span><span class="na">equals</span><span class="o">(</span><span class="n">currentLockId</span><span class="o">))</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="k">if</span> <span class="o">(</span><span class="n">state</span><span class="o">.</span><span class="na">get</span><span class="o">()</span> <span class="o">==</span> <span class="n">0</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">				<span class="n">jedisCommands</span><span class="o">.</span><span class="na">del</span><span class="o">(</span><span class="n">ownerLockKey</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">				<span class="n">jedisCommands</span><span class="o">.</span><span class="na">del</span><span class="o">(</span><span class="n">lockKey</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">			<span class="o">}</span>
</span></span><span class="line"><span class="cl">			<span class="c1">//1000ns
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>			<span class="n">LockSupport</span><span class="o">.</span><span class="na">parkNanos</span><span class="o">(</span><span class="k">this</span><span class="o">,</span> <span class="n">r</span><span class="o">.</span><span class="na">nextInt</span><span class="o">(</span><span class="n">2000</span><span class="o">));</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span> <span class="k">else</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="k">if</span> <span class="o">(</span><span class="n">state</span><span class="o">.</span><span class="na">get</span><span class="o">()</span> <span class="o">!=</span> <span class="n">0</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">				<span class="n">state</span><span class="o">.</span><span class="na">set</span><span class="o">(</span><span class="n">0</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">			<span class="o">}</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl"><span class="o">}</span>
</span></span></code></pre></td></tr></table>
</div>
</div><p>测试代码(同时启动多次，来模拟多个进程间锁的争抢)：</p>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="line"><span class="cl"><span class="kd">public</span> <span class="kd">class</span> <span class="nc">RedisReentrantLock</span> <span class="kd">extends</span> <span class="n">ReentrantLock</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl"><span class="kd">public</span> <span class="kd">static</span> <span class="kt">void</span> <span class="nf">main</span><span class="o">(</span><span class="n">String</span><span class="o">[]</span> <span class="n">args</span><span class="o">)</span> <span class="kd">throws</span> <span class="n">InterruptedException</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="n">String</span> <span class="n">host</span> <span class="o">=</span> <span class="s">&#34;192.168.0.103&#34;</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">		<span class="n">String</span> <span class="n">vmware</span> <span class="o">=</span> <span class="s">&#34;192.168.116.125&#34;</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">		<span class="n">String</span> <span class="n">localhost</span> <span class="o">=</span> <span class="s">&#34;127.0.0.1&#34;</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">		<span class="n">GenericObjectPoolConfig</span> <span class="n">config</span> <span class="o">=</span> <span class="k">new</span> <span class="n">GenericObjectPoolConfig</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">		<span class="n">config</span><span class="o">.</span><span class="na">setMaxIdle</span><span class="o">(</span><span class="n">100</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="n">config</span><span class="o">.</span><span class="na">setMinIdle</span><span class="o">(</span><span class="n">100</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="n">config</span><span class="o">.</span><span class="na">setMaxTotal</span><span class="o">(</span><span class="n">1000</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="n">config</span><span class="o">.</span><span class="na">setMaxWaitMillis</span><span class="o">(-</span><span class="n">1</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="n">config</span><span class="o">.</span><span class="na">setTestWhileIdle</span><span class="o">(</span><span class="kc">true</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="n">config</span><span class="o">.</span><span class="na">setTestWhileIdle</span><span class="o">(</span><span class="kc">true</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="n">config</span><span class="o">.</span><span class="na">setTimeBetweenEvictionRunsMillis</span><span class="o">(</span><span class="n">1000</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="n">JedisPool</span> <span class="n">jedisPool</span> <span class="o">=</span> <span class="k">new</span> <span class="n">JedisPool</span><span class="o">(</span><span class="n">config</span><span class="o">,</span> <span class="n">localhost</span><span class="o">,</span> <span class="n">6379</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="n">Jedis</span> <span class="n">jedis</span> <span class="o">=</span> <span class="k">new</span> <span class="n">Jedis</span><span class="o">(</span><span class="n">localhost</span><span class="o">,</span> <span class="n">6379</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">		<span class="n">RedisReentrantLock</span> <span class="n">lock</span> <span class="o">=</span> <span class="k">new</span> <span class="n">RedisReentrantLock</span><span class="o">(</span><span class="n">jedis</span><span class="o">,</span> <span class="s">&#34;delivery&#34;</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="n">ThreadPoolExecutor</span> <span class="n">threadPool</span> <span class="o">=</span> <span class="k">new</span> <span class="n">ThreadPoolExecutor</span><span class="o">(</span>
</span></span><span class="line"><span class="cl">				<span class="n">50</span><span class="o">,</span> <span class="n">50</span><span class="o">,</span> <span class="n">10</span><span class="o">,</span> <span class="n">TimeUnit</span><span class="o">.</span><span class="na">SECONDS</span><span class="o">,</span>
</span></span><span class="line"><span class="cl">				<span class="k">new</span> <span class="n">ArrayBlockingQueue</span><span class="o">&lt;&gt;(</span><span class="n">50000</span><span class="o">),</span> <span class="k">new</span> <span class="n">ThreadPoolExecutor</span><span class="o">.</span><span class="na">DiscardPolicy</span><span class="o">());</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">		<span class="n">CountDownLatch</span> <span class="n">countDownLatch</span> <span class="o">=</span> <span class="k">new</span> <span class="n">CountDownLatch</span><span class="o">(</span><span class="n">500</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="kt">long</span> <span class="n">t1</span> <span class="o">=</span> <span class="n">System</span><span class="o">.</span><span class="na">currentTimeMillis</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">		<span class="k">for</span> <span class="o">(</span><span class="kt">int</span> <span class="n">i</span> <span class="o">=</span> <span class="n">0</span><span class="o">;</span> <span class="n">i</span> <span class="o">&lt;</span> <span class="n">500</span><span class="o">;</span> <span class="n">i</span><span class="o">++)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="n">threadPool</span><span class="o">.</span><span class="na">execute</span><span class="o">(()</span> <span class="o">-&gt;</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl"><span class="c1">//				Jedis j = jedisPool.getResource();
</span></span></span><span class="line"><span class="cl"><span class="c1">//				Long incr = j.incr(&#34;lock&#34;);
</span></span></span><span class="line"><span class="cl"><span class="c1">//				while (incr != 1) {
</span></span></span><span class="line"><span class="cl"><span class="c1">//					incr = j.incr(&#34;lock&#34;);
</span></span></span><span class="line"><span class="cl"><span class="c1">//				}
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>				<span class="n">lock</span><span class="o">.</span><span class="na">lock</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">				<span class="k">try</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">					<span class="n">System</span><span class="o">.</span><span class="na">out</span><span class="o">.</span><span class="na">println</span><span class="o">(</span><span class="n">Thread</span><span class="o">.</span><span class="na">currentThread</span><span class="o">().</span><span class="na">getName</span><span class="o">()</span> <span class="o">+</span> <span class="s">&#34; start...&#34;</span> <span class="o">+</span> <span class="n">System</span><span class="o">.</span><span class="na">currentTimeMillis</span><span class="o">());</span>
</span></span><span class="line"><span class="cl">					<span class="n">Thread</span><span class="o">.</span><span class="na">sleep</span><span class="o">(</span><span class="n">3000</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">					<span class="n">System</span><span class="o">.</span><span class="na">out</span><span class="o">.</span><span class="na">println</span><span class="o">(</span><span class="n">Thread</span><span class="o">.</span><span class="na">currentThread</span><span class="o">().</span><span class="na">getName</span><span class="o">()</span> <span class="o">+</span> <span class="s">&#34; end...&#34;</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">				<span class="o">}</span> <span class="k">catch</span> <span class="o">(</span><span class="n">InterruptedException</span> <span class="n">e</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">					<span class="n">e</span><span class="o">.</span><span class="na">printStackTrace</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">				<span class="o">}</span> <span class="k">finally</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">					<span class="n">lock</span><span class="o">.</span><span class="na">unlock</span><span class="o">();</span>
</span></span><span class="line"><span class="cl"><span class="c1">//					j.del(&#34;lock&#34;);
</span></span></span><span class="line"><span class="cl"><span class="c1">//					jedisPool.returnResource(j);
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>					<span class="n">countDownLatch</span><span class="o">.</span><span class="na">countDown</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">				<span class="o">}</span>
</span></span><span class="line"><span class="cl">			<span class="o">});</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">		<span class="n">countDownLatch</span><span class="o">.</span><span class="na">await</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">		<span class="kt">long</span> <span class="n">t2</span> <span class="o">=</span> <span class="n">System</span><span class="o">.</span><span class="na">currentTimeMillis</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">		<span class="n">SimpleDateFormat</span> <span class="n">sdf</span> <span class="o">=</span> <span class="k">new</span> <span class="n">SimpleDateFormat</span><span class="o">(</span><span class="s">&#34;yyyy-MM-dd HH:mm:ss&#34;</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="n">System</span><span class="o">.</span><span class="na">out</span><span class="o">.</span><span class="na">println</span><span class="o">(</span><span class="n">sdf</span><span class="o">.</span><span class="na">format</span><span class="o">(</span><span class="n">t1</span><span class="o">));</span>
</span></span><span class="line"><span class="cl">		<span class="n">System</span><span class="o">.</span><span class="na">out</span><span class="o">.</span><span class="na">println</span><span class="o">(</span><span class="n">sdf</span><span class="o">.</span><span class="na">format</span><span class="o">(</span><span class="n">t2</span><span class="o">));</span>
</span></span><span class="line"><span class="cl">		<span class="n">System</span><span class="o">.</span><span class="na">out</span><span class="o">.</span><span class="na">println</span><span class="o">((</span><span class="n">t2</span> <span class="o">-</span> <span class="n">t1</span><span class="o">)</span> <span class="o">/</span> <span class="n">1000f</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl"><span class="o">}</span>
</span></span></code></pre></td></tr></table>
</div>
</div><p>此实现存在的问题：以上代码默认超时时间5秒，如果不加锁超时时间，如果网络抖动或者抢到锁的线程问题导致未能释放锁，就会造成死锁问题；如果加了超时时间，锁超时与下次竞争锁，这之间会存在数据一致性问题。</p>
<p>其他的优化空间：以上的实现中，抢到进程内独占锁的线程，会一直循环，抢不到等待一段时间再抢，这种机制不是很好。可以通过redis发布订阅机制来完善，抢不到redis锁的线程进行休眠，当抢到锁的线程释放了锁，且重入次数归零后，通过发布消息的机制来唤醒其他进程内在等待的线程。唤醒可以使用LockSupport.unpark(thread)；</p></div>

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